Search for flavour-changing neutral-current couplings between the top quark and the photon with the ATLAS detector at & RADIC;s=13 TeV

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dc.WoS.categoriesAstronomy & AstrophysicsPhysics, NuclearPhysics, Particles & Fieldsen_US
dc.authorid0000-0001-5050-8441en_US
dc.contributor.authorÇetin, Serkant Ali
dc.date.accessioned2023-10-04T06:27:57Z
dc.date.available2023-10-04T06:27:57Z
dc.date.issued2023-07-10
dc.departmentFakülteler, Mühendislik ve Doğa Bilimleri Fakültesi, Enerji Sistemleri Mühendisliği Bölümüen_US
dc.description.abstractThis letter documents a search for flavour-changing neutral currents (FCNCs), which are strongly sup-pressed in the Standard Model, in events with a photon and a top quark with the ATLAS detector. The analysis uses data collected in pp collisions at & RADIC;s =13 TeV during Run 2 of the LHC, corresponding to an integrated luminosity of 139 fb-1. Both FCNC top-quark production and decay are considered. The final state consists of a charged lepton, missing transverse momentum, a b-tagged jet, one high-momentum photon and possibly additional jets. A multiclass deep neural network is used to classify events either as signal in one of the two categories, FCNC production or decay, or as background. No significant ex-cess of events over the background prediction is observed and 95% CL upper limits are placed on the strength of left-and right-handed FCNC interactions. The 95% CL bounds on the branching fractions for the FCNC top-quark decays, estimated (expected) from both top-quark production and decay, are B(t & RARR; u & gamma; ) < 0.85 (0.88+0.37 -0.25) x 10-5 and B(t & RARR; c & gamma; ) < 4.2 (3.40+1.35-0.95) x 10-5 for a left-handed tq & gamma; cou-pling, and B(t & RARR; u & gamma; ) < 1.2 (1.20+0.50 -0.33) x10-5 and B(t & RARR; c & gamma; ) < 4.5 (3.70+1.47 -1.03) x10-5 for a right-handed coupling. & COPY; 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons .org /licenses /by /4 .0/). Funded by SCOAP3.en_US
dc.fullTextLevelFull Texten_US
dc.identifier.doi10.1016/j.physletb.2022.137379en_US
dc.identifier.issn1873-2445
dc.identifier.issn0370-2693
dc.identifier.scopus2-s2.0-85146929561en_US
dc.identifier.urihttps://hdl.handle.net/11411/5225
dc.identifier.urihttps://doi.org/10.1016/j.physletb.2022.137379
dc.identifier.wosWOS:001023760300001en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.nationalInternationalen_US
dc.numberofauthors200+en_US
dc.publisherELSEVIERen_US
dc.relation.ispartofPHYSICS LETTERS Ben_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectPAIR PRODUCTIONen_US
dc.subjectPLUS PLUSen_US
dc.subjectDECAYSen_US
dc.titleSearch for flavour-changing neutral-current couplings between the top quark and the photon with the ATLAS detector at & RADIC;s=13 TeVen_US
dc.typeArticleen_US
dc.volume842en_US

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